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I can't see to work out why the fill within the path doesn't line up with it. I have checked to see if I have any transform effect applied to your path, which there isn't. There is no stroke on this image, it is just a fill that seems to be a couple pixels below the path. There is no brush stroke applied as its just a fill.
So I am pretty stumped, here is the image to get an idea of what it looks like.
Thanks for your time guys, any possible solutions would be greatly appreciated!